The phenomenon of many-body Stark localization of bosons in tilted optical lattice is studied. Despite the fact that no disorder is necessary for Stark localization to occur, it is very similar to well-known many-body localization (MBL) in sufficiently strong disorder. Not only the mean gap ratio reaches Poissonian value as characteristic for localized situations, but also the eigenstates reveal multifractal character as in standard MBL. Stark localization enables a coexistence of spacially separated thermal and localized phases in the harmonic trap similarly to fermions. Stark localization may also lead to spectacular trapping of particles in a reversed harmonic field which naively might be considered as an unstable configuration.

中文翻译：

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玻色子中玻色子的多体定位：无序势的动力学

研究了玻色子在倾斜光学晶格中的多体斯塔克局部化现象。尽管事实上没有必要进行Stark定位障碍，但它与已知的足够强的障碍的多体定位（MBL）非常相似。不仅平均间隙比达到了泊松值，这是局部情况的特征，而且本征态也显示出标准MBL中的多重分形特征。严格的局部化使得谐波陷阱中的空间分离的热相和局部相能够像费米子一样共存。严格的局域化还可能导致粒子在逆向谐波场中出现明显的陷获，这在天真的被认为是不稳定的配置。